Nano is very easy to learn, and very usable indeed. Problem is that since I use vim I'm kinda crippled with these kind of text editors - I press Esc very often with no use and j's, k's, l's and h's appear everywhere in my files
I think the best is just to get used to one thing which is good for you - if you do a lot of developing/web design learning vim or emacs is really worth the time. (For vim use "vimtutor" to learn)
If you only edit configuration files now and then, nano is definitely the way to go.